大庆石油地质与开发2024，Vol.43Issue(4)：95-104,10.DOI:10.19597/J.ISSN.1000-3754.202405013
厚层盖层段断层垂向封闭性定量评价方法及其应用
Quantitative evaluation method and its application for vertical fault seal of thick caprock intervals
摘要
Abstract
Faults and fractures are primary factors that lead to vertical adjustment migration or leakage of oil and gas(trap failure),but controlling factors of vertical fault seal of different types of caprock intervals are obviously differ-ent,restricting evaluation of vertical fault seal.Taking thick gypsum caprock and mudstone caprock as study ob-ject,and combining with field observation,rock mechanics test and laboratory reservoir analysis,a quantitative evaluation method for caprock brittle-ductile transition is established based on Byerlee friction law,Mohr-Coulomb fracture criterion and Goetze's criterion,revealing the difference of internal structure of fault zones in different brit-tle/ductile caprock intervals and constructing an evaluation method for vertical fault seal in different brittle/ductile caprocks.The results show that the main controlling factors of vertical fault seal in thick gypsum and mudstone cap-rock intervals are caprock brittleness/ductility,deformation mechanism of fault in caprock intervals and vertical sealing capacity.Vertical fault seal of mudstone caprock in brittle area of Anjihaihe Formation in Zhunnan area is quantitatively characterized by fault juxtaposition thickness(HCJT)method,with HCJT critical value of about 400 m.Vertical fault seal of gypsum caprock in brittle/ductile area of southern flank of Dongqiu anticline in Kuqa Depres-sion is quantitatively characterized by shale smear factor(CSSF),with critical value of 3.5～4.0.The research pro-vides important guidance for three-dimensional stereoscopic exploration of fault-block reservoirs in sedimentary ba-sins in China.关键词
盖层有效性/脆韧性/变形机制/垂向封闭性/油气保存Key words
caprock effectiveness/brittle/ductile/deformation mechanism/vertical seal/oil and gas preservation分类
能源科技引用本文复制引用
付晓飞,王海学,宋宪强,王升,樊明星..厚层盖层段断层垂向封闭性定量评价方法及其应用[J].大庆石油地质与开发,2024,43(4):95-104,10.基金项目
国家自然科学基金重点联合基金项目"断裂对页岩油富集控制作用研究——以松辽盆地南部青一段页岩油为例"(U20A2093) （U20A2093）
黑龙江省博士后资助项目"断层在青山口组页岩段分段变形机制及控制'保存'机理研究"(LBH-Z22255). （LBH-Z22255）
